World’s richest man, Elon Musk, is making a $43 billion takeover bid for Twitter Inc.

Must, who is already Twitter’s second-largest shareholder, said at a TED Talk in Vancouver on Thursday, that the social media company needs to be taken private to grow and become a platform for free speech.

“I think it’s very important for there to be an inclusive arena for free speech,” he said.

Musk made the bid on Wednesday in a letter to the board of Twitter – the micro-blogging platform that has become a global means of communication for individuals and world leaders – and it was made public in a regulatory filing on Thursday.

His offer price of $54.20 per share represents a 38% premium to Twitter’s April 1 close, the last trading day before his 9.1% stake in the social media platform was made public.

Musk, the world’s richest person with a $273.6 billion fortune according to a Forbes tally, rejected an invitation to join Twitter’s board on Saturday after disclosing his stake, a move analysts said signalled his takeover intentions as a board seat would have limited his shareholding to just under 15%.

Musk acquires 9.2% stake in Twitter, now top shareholder

Musk after his TED talk hinted at the possibility of a hostile bid in which he would bypass Twitter’s board and put the offer directly to its shareholders, tweeting: “It would be utterly indefensible not to put this offer to a shareholder vote.”

Twitter was evaluating the offer with guidance from Goldman Sachs and Wilson Sonsini Goodrich & Rosati, according to a source.

The company was also preparing a poison pill as a protective measure against Musk raising his stake as early as Friday, the source said.

Shares of Twitter fell 2% in afternoon trading.

Investors were not immediately convinced.

Jack Dorsey

Saudi Arabia’s Prince Alwaleed bin Talal tweeted from his verified account about the deal. Describing himself as one of the “largest & long-term shareholders of Twitter,” he said Musk’s offer undervalued the company and he rejected it.

Musk, for his part, told Twitter it was his “best and final offer” and said he would reconsider his investment if the board rejects it.

“This is not a way to sort of make money,” Musk said during the TED Talk.

“My strong intuitive sense is that having a public platform that is maximally trusted and broadly inclusive, is extremely important to the future of civilization,” Musk added.

The Star